Acquisitions - Other Information (Details) - USD ($) $ in Thousands					3 Months Ended		9 Months Ended
	Jan. 03, 2022	Oct. 01, 2021	Jun. 07, 2021	Mar. 02, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Business Combinations
Goodwill arising in the acquisition					$ 696,921		$ 696,921		$ 703,371
Revenue					84,700	$ 73,944	249,011	$ 210,758
Net income					$ 3,936	$ (1,762)	$ 5,557	$ (3,567)
Author! B.V.
Business Combinations
Business consideration transferred				$ 2,667
Goodwill arising in the acquisition				1,200
Insight Medical Writing Limited
Business Combinations
Business consideration transferred			$ 15,197
Finite-lived intangible assets acquired			7,400
Goodwill arising in the acquisition			$ 4,700
Pinnacle 21, LLC
Business Combinations
Business consideration transferred		$ 339,075
Goodwill arising in the acquisition		$ 180,947
Equity acquired (as percentage)		100.00%
Discount for lack of mobility (as percentage)		7.00%
Integrated Nonclinical Development Solutions, Inc.
Business Combinations
Business consideration transferred	$ 8,048
Goodwill arising in the acquisition	2,910
Customer relationships | Author! B.V.
Business Combinations
Finite-lived intangible assets acquired				1,200
Customer relationships | Integrated Nonclinical Development Solutions, Inc.
Business Combinations
Finite-lived intangible assets acquired	2,380
Non-compete agreements | Author! B.V.
Business Combinations
Finite-lived intangible assets acquired				$ 100
Non-compete agreements | Integrated Nonclinical Development Solutions, Inc.
Business Combinations
Finite-lived intangible assets acquired	100
Developed technology | Integrated Nonclinical Development Solutions, Inc.
Business Combinations
Finite-lived intangible assets acquired	$ 1,040